Refactor `update_recipe_file.py` to remove KGO files

[ehogan]

• ./app/unittest/kgo/blank_recipe_radiation_budget.yml
  • This is used only in the test_return_blank_recipe() test function.
    • The return_blank_recipe() function currently has two responsibilities: loading a recipe, and removing the contents of the dataset section. These responsibilities should be separated into a load_yaml function and a remove_dataset_contents function, making the purpose of each function clearer.
    • Test the new remove_dataset_contents function by passing in an already-loaded recipe and confirming the returned recipe has an empty dataset section. There is no need to test the load_yaml function.
    • Remove the KGO.
• ./app/unittest/kgo/extended_radiation_budget_recipe.yml
  • This is used only in the test_add_extra_datasets() and test_update_recipe_file() test functions
    • The add_extra_datasets() function currently has three responsibilities: loading the dataset information, constructing the dataset section for a recipe, and adding the dataset section to the recipe. These responsibilities should be separated into a load_yaml function, a construct_dataset_contents function and a add_dataset_contents function, making the purpose of each function clearer.
    • Test the new construct_dataset_contents function and add_dataset_contents function. There is no need to test the load_yaml function.
    • Remove the KGOs.
    • The update_recipe_file() function is the "driver" function. Are other driver functions currently being tested?